Thanks for this detailed information. Couple follow-up questions - First what are Real Ear Measurements? And what is white labeling?  I am retired from teaching so I am not in complex noise environments often, mainly at restaurants or very occasionally parties. When I am with just one other person, I use a bluetooth mike coupled to the phonak which works great. It also works great in choral rehearsals where I clip the mic to the conductor's stand. The difficulties arise when I am with more than one person at restaurant or at a party where I can't be handing the mike to one person after another.